We need to know your exact piston specs first...dish AND how far "down in the hole" they are at TDC. Then we'll be able to more accurately calculate your CR.
Then, decide what you want to do. I'll be glad to send you info on my recent "upgrade" but, its only one of many possibly less expensive directions to take.
You can buy an awful lot of premium gas for the cost of a set of aluminum heads.
I'm a hobbyist. Not a professional. Don't be hatin'!
